Green synthesis of highly stable carbon nanodots and their photocatalytic performance

Mahajan, Rashmi; Bhadwal, Akhshay Singh; Kumar, Nishant; Madhusudanan, Mukil; Pudake, Ramesh Namdeo; Tripathi, Ravi Mani

doi:10.1049/iet-nbt.2016.0025

Cited by 27 publications

(7 citation statements)

References 36 publications

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“…Plant extracts have gained substantial consideration compared to microorganism biomasses of fungi and bacteria because there are no requirements for specific conditions, media, or culture maintenance. Several nanomaterials have already been biosynthesized, such as nanoparticles [3,6,12,13], carbon dots [14], nanoflowers [2,5], alloys [1], and nanofibers [15].…”

Section: Introductionmentioning

confidence: 99%

Enzyme Mimetic Activity of ZnO-Pd Nanosheets Synthesized via a Green Route

et al. 2020

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Recent developments in the area of nanotechnology have focused on the development of nanomaterials with catalytic activities. The enzyme mimics, nanozymes, work efficiently in extreme pH and temperature conditions, and exhibit resistance to protease digestion, in contrast to enzymes. We developed an environment-friendly, cost-effective, and facile biological method for the synthesis of ZnO-Pd nanosheets. This is the first biosynthesis of ZnO-Pd nanosheets. The synthesized nanosheets were characterized by UV–visible spectroscopy, X-ray diffraction (XRD), scanning electron microscopy, transmission electron microscopy, and energy-dispersive X-ray. The d-spacing (inter-atomic spacing) of the palladium nanoparticles in the ZnO sheets was found to be 0.22 nm, which corresponds to the (111) plane. The XRD pattern revealed that the 2θ values of 21.8°, 33.3°, 47.7°, and 56.2° corresponded with the crystal planes of (100), (002), (112), and (201), respectively. The nanosheets were validated to possess peroxidase mimetic activity, which oxidized the 3,3′,5,5′-tetramethylbenzidine (TMB) substrate in the presence of H2O2. After 20 min of incubation time, the colorless TMB substrate oxidized into a dark-blue-colored one and a strong peak was observed at 650 nm. The initial velocities of Pd-ZnO-catalyzed TMB oxidation by H2O2 were analyzed by Michaelis–Menten and Lineweaver–Burk plots, resulting in 64 × 10−6 M, 8.72 × 10−9 Msec−1, and 8.72 × 10−4 sec−1 of KM, Vmax, and kcat, respectively.

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Section: Introductionmentioning

confidence: 99%

Enzyme Mimetic Activity of ZnO-Pd Nanosheets Synthesized via a Green Route

et al. 2020

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“…Nanoparticles also possess the unique property of a high surface to volume ratio, which increases their utility in the catalytic industry where a high surface area is needed, and thereby makes AgNPs good catalysts [7]. In addition to this, AgNPs are also suitable for other applications, such as drug delivery, water distillation, and in healing processes [8, 9]. One of the mechanisms behind the antibacterial activity of AgNPs may be its ability to inhibit microbial growth and disturb cellular enzyme and protein levels [10, 11].…”

Section: Introductionmentioning

confidence: 99%

Biosynthesis of silver nanoparticles using Azadirachta indica leaves: characterisation and impact on Staphylococcus aureus growth and glutathione‐S‐transferase activity

Bhat

Almusallam

Daihan

et al. 2019

IET nanobiotechnol.

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Silver nanoparticles (AgNPs) are toxic to various microbes, but the mechanism of action is not fully understood. The present report explores Azadirachta indica leaf extract as a reducing agent for the rapid biosynthesis of AgNPs. The effects of AgNPs on the growth, glutathione-S-transferase (GST) activity, and total protein concentration in Staphylococcus aureus were investigated, as was its antibacterial activity against seven other bacterial strains. Nanoparticle synthesis was confirmed by the UV-Vis spectrum and colour change of the solution. Scanning electron microscopy (SEM), transmission electron microscopy (TEM), dynamic light scattering (DLS), zeta potential analysis, and infrared spectroscopy were used to characterise the synthesised nanoparticles. The UV-Visible spectrograph showed an absorbance peak at 420 nm. DLS analysis showed an average AgNP size of 159 nm and a Polydispersity Index of 0.373. SEM analysis showed spherical particle shapes, while TEM established an average AgNP size of 7.5 nm. The element analysis profile showed small peaks for calcium, potassium, zinc, chlorine, with the presence of oxygen and silver. AgNPs markedly affected the growth curves and GST activity in treated bacteria, and produced moderate antibacterial activity. Thus AgNPs synthesised from A. indica leaves can interrupt the growth curve and total protein concentration in bacterial cells.

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“…Hence, researchers have focused on facile, cost-effective, nontoxic, environmentally friendly, green chemistry methods for synthesizing NPs. Nowadays, researchers have been adopting biological routes for the synthesis of nanomaterials using fungal [1,7,8] and bacterial [9] biomasses as well as plant extracts [10][11][12]. Of these biomaterials, plant extracts have gained the attention of researchers over bacterial and fungal biomasses.…”

Section: Introductionmentioning

confidence: 99%

Facile Synthesis of Triangular and Hexagonal Anionic Gold Nanoparticles and Evaluation of Their Cytotoxicity

et al. 2019

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Comprehension of the shape-dependent properties of gold nanoparticles (AuNPs) could benefit the advancements in cellular uptake efficiency. Spherical AuNPs have generally been used for drug delivery, and recent research has indicated that the cellular uptake of triangular AuNPs was higher than that of spherical ones. Previous reports have also revealed that chemically synthesized AuNPs were cytotoxic. Therefore, we have developed a facile, cost-effective, and environmentally friendly method for synthesizing triangular and hexagonal anionic AuNPs. The zeta potential of the synthesized AuNPs was negative, which indicated that their surface could be easily functionalized with positively charged molecules to upload drugs or biomolecules. Transmission electron microscopy (TEM) images illustrated that the largest particle size of the synthesized quasi-hexagonal AuNPs was 61 nm. The TEM images also illustrated that two types of equilateral-triangular AuNPs were synthesized: One featured sharp and the other rounded corners. The sides of the smallest and largest triangular AuNPs were 23 and 178 nm, respectively. Energy-dispersive X-ray spectra of the green-synthesized AuNPs indicated that they consisted entirely of elemental Au. The cytotoxicity of the green-synthesized AuNPs was evaluated using 3T3-L1 adipocytes. Using cell viability data, we determined that the green-synthesized AuNPs did not exhibit any cytotoxic effects on 3T3-L1 adipocytes.

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Green synthesis of highly stable carbon nanodots and their photocatalytic performance

Cited by 27 publications

References 36 publications

Enzyme Mimetic Activity of ZnO-Pd Nanosheets Synthesized via a Green Route

Enzyme Mimetic Activity of ZnO-Pd Nanosheets Synthesized via a Green Route

Biosynthesis of silver nanoparticles using Azadirachta indica leaves: characterisation and impact on Staphylococcus aureus growth and glutathione‐S‐transferase activity

Facile Synthesis of Triangular and Hexagonal Anionic Gold Nanoparticles and Evaluation of Their Cytotoxicity

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